Phase lock loop

Details Phase lock loop Phase lock loop

1977-03-21

1979-02-06

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, H03B 304

Patent

active

041386507

ABSTRACT:
A phase lock circuit has a voltage tuned oscillator (VTO) which is tuned by a tuning circuit. The tuning circuit supplies tune-up and tune-down (in frequency) signals to phase lock the VTO with respect to a reference signal. The tuning circuit supplies the tune-up and tune-down signals based on the results of samples of the VTO output from a variable modulus counter (VMC) with respect to a reference signal. The reference signal and VMC are reset to a time reference by a reset generator during coarse tuning or phase locking.

REFERENCES:
patent: 3259851 (1966-07-01), Brauer
patent: 3988696 (1976-10-01), Sharpe

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